Ragweed pollen
Bildnummer 11999075
| Ragweed pollen. Coloured Scanning Electron Micro- graph (SEM) of pollen grains on the stigma of a ragweed plant Ambrosia sp. The grains of pollen (yellow) have a spiked surface appearance. The multi-lobed stigma is green. Ambrosia is a daisy- like flower which grows in bare and waste ground. Its pollen is windborne and released in great quantities for cross-pollination. Ambrosia pollen acts as an allergen causing hay fever (pollenosis) in allergic individuals. Sufferers produce a sensitive antibody which is found on the surface of cells in the nose and eyes; the antibody reacts to the pollen and the nose,throat and eyes become inflamed. Magnification: x150 at 5x7cm size | |
| Lizenzart: | Lizenzpflichtig |
| Credit: | Science Photo Library / Biophoto Associates |
| Bildgröße: | 4653 px × 3169 px |
| Modell-Rechte: | nicht erforderlich |
| Eigentums-Rechte: | nicht erforderlich |
| Restrictions: |
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